[PATCH v1 0/6] Fix page permission on arm64 architectures

[Ilias Apalodimas]

Hi!
This is v1 of [0].

This is an attempt to map the U-Boot binary properly, but leave the
area we load binaries unaffected and RWX.

There's a few changes since the RFC
- Fixed the alignment of meminfo command when printing regions
- 'meminfo' now prints arch specific attributes e.g PXN, UXN etc for arm
  instead of RW, RO, RX
- Since we don't set the permissions of EFI runtime services yet and keep
  them as RWX, I removed the linker alignment changes which makes patch #3
  easier to review. It's worth noting that qemu-arm sbsa was crashing with
  the efi services page aligned. This is probably due to a mismatch of
  memory, since the crash is only reproducible with QEMU instances that
  have < 2 GB of RAM. I'll fix that along with the efi runtime services
- Defined memory attribute changes properly with an enum for RW, RO, RX
  instead of the hardcoded '1,2,3' I had on the RFC
- Enabling mappings is now under a Kconfig (CONFIG_MMU_PGPROT), since
  peope reported crashes when testing this, which are orthogonal to this
  patch. We still have places in U-Boot where we define and later write
  const variables. This will lead to a crash now as const variables are
  properly managed and places in RO memory
- Split patches to be easier to review
- Added a patch updating 'meminfo'
- Picked up acked-by tags from Jerome

patch #1 adds printing capabilities for page mappings in 'meminfo'
patch #2 adds documention in 'meminfo' command
patch #3 prepares linker scripts, aligns sections in page boundaries etc
patch #4 prepares an internal function to change the PTEs
patch #5 adds function definitions & stubs for all archs
patch #6 wires up the changes in U-Boot after it relocates

[0] https://lore.kernel.org/u-boot/20250130072100.27297-1-ilias.apalodimas@linaro.org/

Ilias Apalodimas (6):
  meminfo: add memory details for armv8
  doc: update meminfo with arch specific information
  arm: Prepare linker scripts for memory permissions
  arm64: mmu_change_region_attr() add an option not to break PTEs
  treewide: Add a function to change page permissions
  arm64: Enable RW, RX and RO mappings for the relocated binary

 arch/arc/lib/cache.c                    |  2 +
 arch/arm/cpu/arm926ejs/cache.c          |  2 +
 arch/arm/cpu/armv7/cache_v7.c           |  1 +
 arch/arm/cpu/armv7m/cache.c             |  2 +
 arch/arm/cpu/armv8/cache_v8.c           | 54 +++++++++++++++++--
 arch/arm/cpu/armv8/fsl-layerscape/cpu.c | 10 ++--
 arch/arm/cpu/armv8/u-boot.lds           | 29 +++++-----
 arch/arm/include/asm/armv8/mmu.h        |  2 +
 arch/arm/include/asm/system.h           | 11 +++-
 arch/arm/lib/cache.c                    |  2 +
 arch/arm/mach-snapdragon/board.c        |  2 +-
 arch/m68k/lib/cache.c                   |  2 +
 arch/nios2/lib/cache.c                  |  2 +
 arch/powerpc/lib/cache.c                |  2 +
 arch/riscv/lib/cache.c                  |  2 +
 arch/sh/cpu/sh4/cache.c                 |  2 +
 arch/xtensa/lib/cache.c                 |  2 +
 cmd/meminfo.c                           |  5 ++
 common/Kconfig                          | 13 +++++
 common/board_r.c                        | 20 +++++++
 doc/usage/cmd/meminfo.rst               | 71 ++++++++++++++++++-------
 include/asm-generic/sections.h          |  2 +
 include/cpu_func.h                      | 16 ++++++
 23 files changed, 215 insertions(+), 41 deletions(-)

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2.47.2